Which of the following statements are true concerning the mean of the differences between two dependent samples (matched pairs)? Select all that apply. A. If one has more than 20 matched pairs of sample data, one can consider the sample to be large and there is no need to check for normality. B. The requirement of a simple random sample is satisfied if we have matched pairs of convenience sampling data. C. The methods used to evaluate the mean of the differences between two dependent variables apply if one has 91 IQ scores of workers from Ohio and 91 IQ scores of workers from Texas. D. If one wants to use a confidence interval to test the claim that mu Subscript d Baseline greater than 0 with a 0.01 significance level, the confidence interval should have a confidence level of 98%. E. If one has ten matched pairs of sample data, there is a loose requirement that the ten differences appear to be from a normally distributed population.